Grüner See or the Green Lake in Austria is actually a small valley filled with freshwater during the snow melt from May to July. It is located in Tragöß, Styria, which sits at the foot of snow-capped Hochschwab mountains. And it is beautiful!
Throughout the frozen winter months the area is almost completely dry and is used as a county park. It is a particular favorite site for hikers.
But as soon as the temperatures begin to rise in spring, the ice and snow on the mountaintops begins to melt and runs down into the basin of land below.
The park fills up with ice-cold crystal clear water, which gets its distinctive green coloring from the grass and foliage beneath.
The water levels rise from about one or two meters deep in the winter to as much as 10 meters in the late spring and early summer.